Refrigeration plant of the intermittent-absorption type



l. AMUNDSEN ET AL REFRIGERATION PLANT OF THE INTERMITTENT ABSORPTION TYPE Filed May 9, 1928 .mQwBWZ 7's: flay final/mean and Erik SWMMGM,

Patented Apr. 2, EQZQ.

warren snares v otan PATENT entrees WAR AM'UNDSEN, OF OSLO, AND ERIK STEPHA NSEN, F SLEMDAL, NEAR OSLO, INOR- WAY; SAID STEPHANSEN ASSIGNOR T0 SAID AMUNDSEN.

REFRIGMTION PLANT OF THE INTERMI'TTENT-ABSORPTION TYPE.

Application filed may 9, 1928, Serial No. 276,473, and in Norway February 27, A928. I

This invention relates to refrigeration plants of the absorption type (adsorption type) where the absorption vessel is alternatingly heated and cooled and where the supply of cooling water to the absorption vessel comes through a siphon tube from a cooling water tank.

The duration of the heating period for the absorption vessel for an apparatus of this find ought to be shorter when the cooling'water temperature is high to get the most economical operation, because by the higher temperature of the cooling water there is less absorbed cooling medium to be driven out. The invention intends to improve the siphon system for the cooling water supply in such a way that the siphon effect is started eariler by a higher temperature of the cooling water than by a lower temperature, the heating arrangement for the absorption vessel being in a known manner controlled by means of the intermittent .water su ply.

In accordance with the invention, this is obtained by arran ing the inlet for the si hon which is open. at the bottom and the upper closed part of which is connected to an air container placed in the outlet from the heating chamber -of the absorption vessel.

so At the same time the cooling water tank is supplied with an overflow outlet placed somewhat'below the highest point of the siphon whereby the level in the water tank can never reach such a height that the siphon efiect may start for that reason.

When the heating of the absorption vessel is advanced so far that the air container inthe upper outlet is heated, then the air in this container will expand and press the water level downward in the submerged bell'which encloses the inlet opening for the siphon until by a certain temperature in the ex ansion vessel an air bubble will bepresse up in the siphon. This air bubblewill rise up over the overflow so that the siphon efiect starts.

When the water in the water tank by means of the siphon has been sucked down to a level corresponding to the lower edge of the submerged bell, air will enter into this from the outside thereby renewing the air filling of the bell and at the same time stopping the siphon effect. A new heating perlod is to thereby started.

a little above the ottom of a submerge bell in the siphon tube thereby forcing the water In the drawing in which the sole figure shows a form of the invention in vertical section, and largely diagrammatic,

1 is the absorption vessel and 2 is the cooling and heatlng .jacket'; 3 is the outlet conduit from jacket 2; 4 the cooling water tank and 5 the siphon leading from the cooling water tank 4 to jacket 2.

In the outlet 3 is placed a closed expansion vessel 6' which by means of the tube 7 is connected to the upper part of a submerged bell ;8, the lower edge of which is a little below the inlet opening 10 for the siphon 5.

During the heating period the Water level rises 1n the water tank {1 up to the level indicated by the'line 11, and is kept constantly on thls level; the water which is led to the tank through the water so ply tube 13 is running out through the over ow 14. The water level in the siphon 5 is kept on the same level as in the tank, that is to say, somewhat lower than the h ghest point of the siphon, while the level in the submerged bell, for instance, is

at the indicated line 12.

When the heating of the absorption vessel' has advanced to the point where the expanslon vessel 6 will be heated, the air in this vessel will expand, thereby forcing the water level 12 downwards until it comes below the inlet opening 10 for the siphon. The 8 air WlllCh now is going up into the siphon tube 5 forces the water in the siphon over the over-flow whereby the siphon client is immediatel started at the same time starting the coo ing of the absorption vessel and preferably of the expansion vessel so-that the water level in thesubmerge'd bell will r1se. r

The siphon efl'ect'will continue'until the level line 11 reaches 'below the lower edge 9 of the submerged bell. At this moment the siphon, efiect is automatically broken ed, at the same time new air being led to the interior of the submerged bell.

It will be understood that the starting of the" siphon efi'ect in accordance with this invention is not controlled by the level of the Water in the coolin water tank 4, this levelbein'g constant at t e level 11 when once it has reached this level; but the siphon eflect is started-and thereby stoppin the heating and starting the cooling cycle 0 the plantwhen the absorption vessel is heated through. This is naturally the right oint to stop the heating and the time it will e automatlcally stopped is in every case dependent upon the conditions under which the refrigerating plant is working, such as temperature of the cooling water and in the evaporator and of the duration of the absorption period. The duration of this period will however, be kept constant by regulating the dimension ofthe outlet orifice in the usual manner.

To obtain a rapid cooling of the expansion vessel by the starting of the siphon effect, it is appropriate as shown on the drawing to lead the siphon tube 5 through or close to the expansion vessel, but this is not absolutely necessary.

The arrangement is especially advantageous when used in connection with such refrigerating apparatuses where the absorp tion wssel is heated b means of steam or other vapour, thereby o aining a very rapid increase in temperature in the outlet when the temperature in the absorption vessel has increased to such a point that a part of the steam is going up through the outlet 3. But

it will of course be understood that the invention is not limited for use in connection with apparatuses with this sort of heating.

\Vhatwe claim is: 1. ln refrigeratingapparatus of the type including an absorbing or adsorbing vessel having a heating jacket, means for intermitmoaeoe tently supplying cooling water to said absorbmg vessel comprising a reservoir, a s1- phon leading from said reservoir to a dis-- charge point'in operative relation to said absorbing vessel, a submerged bell in said reservoir having an open bottom, the inlet end of said siphon terminating within said bell a little above the plane of the open end thereof, a gaseous fluid container arranged in the outlet of said heating jacket said container being in communication with said hell.

2. Apparatus as claimed in claim 1, the cooling water reservoir being supplied with an overflow on a level somewhat below the highest point of the siphon so that the starting of the siphon cannot be incited by the water level in said reservoir, but is controlled solely through the expansion of the gaseous fluid in said container, said fluid expanding when the container is heated thereby pressing a bubble from the submerged bell up into the siphon, whereby the siphon effect is started.

3. Apparatus as claimed in claim 1 the siphon being placed in such relation to the container, that the water coming through the siphon directly cools said container.

lln testimony whereof we have signed our names to this specification.

IVAR AMUNDSEN. ERIK STEPHANSEN. 

